I think I answered my own question and it cost me about 2,000 Gems I had one lvl 2 Topaz in the merge grid and hit the button. I ended up with a lvl 4 Topaz and about 2k fewer Gems. I could have bought it in the Fair for 140 Gems tops. Fo what does it do? It makes the Developers richer and me poorer . and there was no explanation or waning that my gems were going to be spent . The game asks me if I am sure I want to spend 1 Gem to open a slot for a rock in a weapon, but spends 2000 gems with no warning or confirmation. That is not right.